topic Re: More Memory For Fortran Program in Operating System - HP-UX

More Memory For Fortran Program

Pete Randall — Wed, 22 Mar 2006 12:16:59 GMT

My R&D folks are trying to run a Fortran program that seems to be running out of memory. According to them, they get up to 850 MB of memory allocated and things are still fine, but when they try to add one more vector of 150 MB, the program crashes with the following message:

FORTRAN Runtime ERROR:
Memory allocation failed

I assume that I need to increase one of the max_size kernel parameters but I'm not sure which one - data, text?

Pete

Re: More Memory For Fortran Program

Jeff Schussele — Wed, 22 Mar 2006 12:45:03 GMT

Pete,

Have you checked the "bitness" of that binary.
If it's 32 then they could be hitting the quadrant wall. They may need to chatr that thing so that it can address more memory.
Also they may be asking for contigous memory & things are too fragmented for that last chunk.

Rgds,
Jeff

Re: More Memory For Fortran Program

Pete Randall — Wed, 22 Mar 2006 12:52:33 GMT

Jeff,

Running "file" against the binary simply returns "create_035.f90: fortran program text". Is there some other way to test bitness?

Pete

Re: More Memory For Fortran Program

Alzhy — Wed, 22 Mar 2006 13:02:58 GMT

Unsure but perhaps your 32-bit(?) fortran code is exceeding its quadrant memory demand? Relocate the excutable to a different quadrant via the chatr command perhaps?

chatr +3qp ?

HTH

Re: More Memory For Fortran Program

Pete Randall — Wed, 22 Mar 2006 13:05:09 GMT

Thanks, Nelson. I'm still not sure that it's 32 bit code but will keep that in mind.

Pete

Re: More Memory For Fortran Program

Jeff Schussele — Wed, 22 Mar 2006 13:07:08 GMT

Hi Pete,

Run file against the Fortran binary.
Appears this is like a Java executable that will actually call the Java binary to do the heavy lifting.

HTH,
Jeff

Re: More Memory For Fortran Program

Pete Randall — Wed, 22 Mar 2006 13:12:38 GMT

Jeff,

Duh!

# file create_035.o
create_035.o: PA-RISC2.0 relocatable object

I believe that's telling me it's 32 bit, right?

I wonder if there's a compiler option to make it 64 bit.

Pete

Re: More Memory For Fortran Program

Pete Randall — Wed, 22 Mar 2006 13:20:47 GMT

Imagine that! There is an option: "+DA2.0W"

Pete